Lock for securing a mark especially onto a textile article

Claim 1

A lock preferably for an alarm for marking articles for sale, said lock comprising first and second members automatically interengaging when one member is inserted in a cavity in the other member, whereby said first member comprises a rod-shaped body, the inserting end of which is completely or partially pointed, a third member loosely inserted in the cavity in the second member, said third member comprising one or more inner surfaces capable of being tangent to and cooperating with corresponding inner surfaces on the second member, these surfaces further being inclined upwards and inwards when seen in a vertical sectional view through the lock with the inlet of the cavity facing upwards, whereby the cavity is pointed upwards towards the inlet of the cavity and whereby a spring with an upward elastic force is situated in the cavity below the loosely positioned third member, said second member being of a non-magnetizable material and said third member being of a magnetizable material to be attracted by a magnet and defining at least one projection for engaging the rod-shaped body, said projection being formed as a one piece, integral part of the third member, the second member comprising an upper non-magnetic portion and a lower non-magnetic portion, the lower portion being cast with an upwardly inclined flap forming the spring below the loosely positioned third member.